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NetBSD/sys/nfs/nfs_vfsops.c

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/* $NetBSD: nfs_vfsops.c,v 1.237 2018/09/03 16:29:36 riastradh Exp $ */
/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.237 2018/09/03 16:29:36 riastradh Exp $");
#if defined(_KERNEL_OPT)
#include "opt_nfs.h"
#endif
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/device.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/dirent.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/timetc.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nfs_var.h>
MODULE(MODULE_CLASS_VFS, nfs, NULL);
extern struct nfsstats nfsstats;
extern int nfs_ticks;
/*
* keep a count of the nfs mounts to generate ficticious drive names
* for the per drive stats.
*/
unsigned int nfs_mount_count = 0;
int nfs_commitsize;
/*
* nfs vfs operations.
*/
extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
&nfsv2_vnodeop_opv_desc,
&spec_nfsv2nodeop_opv_desc,
&fifo_nfsv2nodeop_opv_desc,
NULL,
};
struct vfsops nfs_vfsops = {
.vfs_name = MOUNT_NFS,
.vfs_min_mount_data = sizeof (struct nfs_args),
.vfs_mount = nfs_mount,
.vfs_start = nfs_start,
.vfs_unmount = nfs_unmount,
.vfs_root = nfs_root,
.vfs_quotactl = (void *)eopnotsupp,
.vfs_statvfs = nfs_statvfs,
.vfs_sync = nfs_sync,
.vfs_loadvnode = nfs_loadvnode,
.vfs_vget = nfs_vget,
.vfs_fhtovp = nfs_fhtovp,
.vfs_vptofh = nfs_vptofh,
.vfs_init = nfs_vfs_init,
.vfs_done = nfs_vfs_done,
.vfs_mountroot = nfs_mountroot,
.vfs_snapshot = (void *)eopnotsupp,
.vfs_extattrctl = vfs_stdextattrctl,
.vfs_suspendctl = genfs_suspendctl,
.vfs_renamelock_enter = genfs_renamelock_enter,
.vfs_renamelock_exit = genfs_renamelock_exit,
.vfs_fsync = (void *)eopnotsupp,
.vfs_opv_descs = nfs_vnodeopv_descs
};
extern u_int32_t nfs_procids[NFS_NPROCS];
extern u_int32_t nfs_prog, nfs_vers;
static struct sysctllog *nfs_clog;
static int nfs_mount_diskless(struct nfs_dlmount *, const char *,
struct mount **, struct vnode **, struct lwp *);
static void nfs_sysctl_init(void);
static void nfs_sysctl_fini(void);
static int
nfs_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&nfs_vfsops);
if (error == 0) {
nfs_sysctl_init();
}
return error;
case MODULE_CMD_FINI:
error = vfs_detach(&nfs_vfsops);
if (error == 0) {
nfs_sysctl_fini();
}
return error;
default:
return ENOTTY;
}
}
/*
* nfs statvfs call
*/
int
nfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct lwp *l = curlwp;
struct vnode *vp;
struct nfs_statfs *sfp;
char *cp;
u_int32_t *tl;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, retattr;
#ifdef NFS_V2_ONLY
const int v3 = 0;
#else
int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
#endif
struct mbuf *mreq, *mrep = NULL, *md, *mb;
kauth_cred_t cred;
u_quad_t tquad;
struct nfsnode *np;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
vp = nmp->nm_vnode;
np = VTONFS(vp);
cred = kauth_cred_alloc();
#ifndef NFS_V2_ONLY
if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, l);
#endif
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
nfsm_fhtom(np, v3);
nfsm_request(np, NFSPROC_FSSTAT, l, cred);
if (v3)
nfsm_postop_attr(vp, retattr, 0);
if (error) {
if (mrep != NULL) {
if (mrep->m_next != NULL)
printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
m_freem(mrep);
}
goto nfsmout;
}
nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
sbp->f_flag = nmp->nm_flag;
sbp->f_iosize = uimin(nmp->nm_rsize, nmp->nm_wsize);
if (v3) {
sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_abytes);
tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
sbp->f_bresvd = sbp->f_bfree - tquad;
sbp->f_bavail = tquad;
/* Handle older NFS servers returning negative values */
if ((quad_t)sbp->f_bavail < 0)
sbp->f_bavail = 0;
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_favail = tquad;
sbp->f_fresvd = 0;
sbp->f_namemax = NFS_MAXNAMLEN;
} else {
sbp->f_bsize = NFS_FABLKSIZE;
sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
sbp->f_fresvd = 0;
sbp->f_files = 0;
sbp->f_ffree = 0;
sbp->f_favail = 0;
sbp->f_fresvd = 0;
sbp->f_namemax = NFS_MAXNAMLEN;
}
copy_statvfs_info(sbp, mp);
nfsm_reqdone;
kauth_cred_free(cred);
return (error);
}
#ifndef NFS_V2_ONLY
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l)
{
struct nfsv3_fsinfo *fsp;
char *cp;
int32_t t1, t2;
u_int32_t *tl, pref, xmax;
char *bpos, *dpos, *cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb;
u_int64_t maxfsize;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_FSINFO]++;
nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
nfsm_fhtom(np, 1);
nfsm_request(np, NFSPROC_FSINFO, l, cred);
nfsm_postop_attr(vp, retattr, 0);
if (!error) {
nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (xmax < nmp->nm_wsize && xmax > 0) {
nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = xmax;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (xmax < nmp->nm_rsize && xmax > 0) {
nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = xmax;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
~(NFS_DIRFRAGSIZ - 1);
if (xmax < nmp->nm_readdirsize && xmax > 0) {
nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = xmax;
}
/* XXX */
nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = maxfsize;
nmp->nm_mountp->mnt_fs_bshift =
ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
nmp->nm_iflag |= NFSMNT_GOTFSINFO;
}
nfsm_reqdone;
return (error);
}
#endif
/*
* Mount a remote root fs via. NFS. It goes like this:
* - Call nfs_boot_init() to fill in the nfs_diskless struct
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
int
nfs_mountroot(void)
{
struct timespec ts;
struct nfs_diskless *nd;
struct vattr attr;
struct mount *mp;
struct vnode *vp;
struct lwp *l;
long n;
int error;
l = curlwp; /* XXX */
if (device_class(root_device) != DV_IFNET)
return (ENODEV);
/*
* XXX time must be non-zero when we init the interface or else
* the arp code will wedge. [Fixed now in if_ether.c]
* However, the NFS attribute cache gives false "hits" when the
* current time < nfs_attrtimeo(nmp, np) so keep this in for now.
*/
if (time_second < NFS_MAXATTRTIMO) {
ts.tv_sec = NFS_MAXATTRTIMO;
ts.tv_nsec = 0;
tc_setclock(&ts);
}
/*
* Call nfs_boot_init() to fill in the nfs_diskless struct.
* Side effect: Finds and configures a network interface.
*/
nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
error = nfs_boot_init(nd, l);
if (error) {
kmem_free(nd, sizeof(*nd));
return (error);
}
/*
* Create the root mount point.
*/
error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l);
if (error)
goto out;
printf("root on %s\n", nd->nd_root.ndm_host);
/*
* Link it into the mount list.
*/
mountlist_append(mp);
rootvp = vp;
mp->mnt_vnodecovered = NULLVP;
vfs_unbusy(mp);
/* Get root attributes (for the time). */
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &attr, l->l_cred);
VOP_UNLOCK(vp);
if (error)
panic("nfs_mountroot: getattr for root");
n = attr.va_atime.tv_sec;
#ifdef DEBUG
printf("root time: 0x%lx\n", n);
#endif
setrootfstime(n);
out:
if (error)
nfs_boot_cleanup(nd, l);
kmem_free(nd, sizeof(*nd));
return (error);
}
/*
* Internal version of mount system call for diskless setup.
* Separate function because we used to call it twice.
* (once for root and once for swap)
*/
static int
nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l)
/* mntname: mount point name */
{
struct mount *mp;
struct mbuf *m;
int error;
vfs_rootmountalloc(MOUNT_NFS, mntname, &mp);
mp->mnt_op = &nfs_vfsops;
/*
* Historical practice expects NFS root file systems to
* be initially mounted r/w.
*/
mp->mnt_flag &= ~MNT_RDONLY;
/* Get mbuf for server sockaddr. */
m = m_get(M_WAIT, MT_SONAME);
if (m == NULL)
panic("nfs_mountroot: mget soname for %s", mntname);
MCLAIM(m, &nfs_mowner);
memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr,
(m->m_len = ndmntp->ndm_args.addr->sa_len));
error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
ndmntp->ndm_args.hostname, vpp, l);
if (error) {
vfs_unbusy(mp);
vfs_rele(mp);
printf("nfs_mountroot: mount %s failed: %d\n",
mntname, error);
} else
*mpp = mp;
return (error);
}
void
nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l)
{
int s;
int adjsock;
int maxio;
s = splsoftnet();
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
*/
if (argp->sotype == SOCK_STREAM)
argp->flags &= ~NFSMNT_NOCONN;
/*
* Cookie translation is not needed for v2, silently ignore it.
*/
if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
NFSMNT_XLATECOOKIE)
argp->flags &= ~NFSMNT_XLATECOOKIE;
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
/* Update flags. */
nmp->nm_flag = argp->flags;
splx(s);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
nmp->nm_retry = argp->retrans;
if (nmp->nm_retry > NFS_MAXREXMIT)
nmp->nm_retry = NFS_MAXREXMIT;
}
#ifndef NFS_V2_ONLY
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
#endif
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
int osize = nmp->nm_wsize;
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_wsize != osize);
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
int osize = nmp->nm_rsize;
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_rsize != osize);
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
nmp->nm_readdirsize = argp->readdirsize;
/* Round down to multiple of minimum blocksize */
nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
/* Bigger than buffer size makes no sense */
if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
nmp->nm_readdirsize = NFS_DIRBLKSIZ;
} else if (argp->flags & NFSMNT_RSIZE)
nmp->nm_readdirsize = nmp->nm_rsize;
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
argp->deadthresh <= NFS_NEVERDEAD)
nmp->nm_deadthresh = argp->deadthresh;
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_so && adjsock) {
nfs_safedisconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, (struct nfsreq *)0, l)) {
printf("nfs_args: retrying connect\n");
kpause("nfscn3", false, hz, NULL);
}
}
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* memcpy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
int
nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
int error;
struct nfs_args *args = data;
struct mbuf *nam;
struct nfsmount *nmp = VFSTONFS(mp);
struct sockaddr *sa;
struct vnode *vp;
char *pth, *hst;
size_t len;
u_char *nfh;
if (args == NULL)
return EINVAL;
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
if (nmp == NULL)
return (EIO);
if (args->addr != NULL) {
sa = mtod(nmp->nm_nam, struct sockaddr *);
error = copyout(sa, args->addr, sa->sa_len);
if (error)
return (error);
args->addrlen = sa->sa_len;
} else
args->addrlen = 0;
args->version = NFS_ARGSVERSION;
args->sotype = nmp->nm_sotype;
args->proto = nmp->nm_soproto;
args->fh = NULL;
args->fhsize = 0;
args->flags = nmp->nm_flag;
args->wsize = nmp->nm_wsize;
args->rsize = nmp->nm_rsize;
args->readdirsize = nmp->nm_readdirsize;
args->timeo = nmp->nm_timeo;
args->retrans = nmp->nm_retry;
args->maxgrouplist = nmp->nm_numgrps;
args->readahead = nmp->nm_readahead;
args->leaseterm = 0; /* dummy */
args->deadthresh = nmp->nm_deadthresh;
args->hostname = NULL;
*data_len = sizeof *args;
return 0;
}
if (args->version != NFS_ARGSVERSION)
return (EPROGMISMATCH);
if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB))
return (EPROGUNAVAIL);
#ifdef NFS_V2_ONLY
if (args->flags & NFSMNT_NFSV3)
return (EPROGMISMATCH);
#endif
if (mp->mnt_flag & MNT_UPDATE) {
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3, or change cookie translation
*/
args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) |
(nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE));
nfs_decode_args(nmp, args, l);
return (0);
}
if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
return (EINVAL);
nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK);
error = copyin(args->fh, nfh, args->fhsize);
if (error)
goto free_nfh;
pth = malloc(MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(path, pth, MNAMELEN - 1, &len);
if (error)
goto free_pth;
memset(&pth[len], 0, MNAMELEN - len);
hst = malloc(MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len);
if (error)
goto free_hst;
memset(&hst[len], 0, MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = sockargs(&nam, args->addr, args->addrlen, UIO_USERSPACE,
MT_SONAME);
if (error)
goto free_hst;
MCLAIM(nam, &nfs_mowner);
args->fh = nfh;
error = mountnfs(args, mp, nam, pth, hst, &vp, l);
free_hst:
free(hst, M_TEMP);
free_pth:
free(pth, M_TEMP);
free_nfh:
free(nfh, M_TEMP);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l)
{
struct nfsmount *nmp;
struct nfsnode *np;
struct vnode *vp;
int error;
struct vattr *attrs;
kauth_cred_t cr;
char iosname[IOSTATNAMELEN];
/*
* If the number of nfs iothreads to use has never
* been set, create a reasonable number of them.
*/
if (nfs_niothreads < 0) {
nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS);
}
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
/* update paths, file handles, etc, here XXX */
m_freem(nam);
return (0);
} else {
nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
mp->mnt_data = nmp;
TAILQ_INIT(&nmp->nm_uidlruhead);
TAILQ_INIT(&nmp->nm_bufq);
rw_init(&nmp->nm_writeverflock);
mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
cv_init(&nmp->nm_rcvcv, "nfsrcv");
cv_init(&nmp->nm_sndcv, "nfssnd");
cv_init(&nmp->nm_aiocv, "nfsaio");
cv_init(&nmp->nm_disconcv, "nfsdis");
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
#ifndef NFS_V2_ONLY
if ((argp->flags & NFSMNT_NFSV3) == 0)
#endif
{
if (argp->fhsize != NFSX_V2FH) {
return EINVAL;
}
}
/*
* V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
* will overwrite this.
*/
nmp->nm_maxfilesize = 0xffffffffLL;
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_deadthresh = NFS_DEFDEADTHRESH;
error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE,
mp->mnt_op->vfs_name, mp, l);
if (error)
goto bad;
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
nfs_decode_args(nmp, argp, l);
mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
mp->mnt_dev_bshift = DEV_BSHIFT;
/*
* For Connection based sockets (TCP,...) defer the connect until
* the first request, in case the server is not responding.
*/
if (nmp->nm_sotype == SOCK_DGRAM &&
(error = nfs_connect(nmp, (struct nfsreq *)0, l)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statvfs() here since we can get
* stuck on a dead server and we are holding a lock on the mount
* point.
*/
mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
if (error)
goto bad;
vp = NFSTOV(np);
attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK);
VOP_GETATTR(vp, attrs, l->l_cred);
if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) {
cr = kauth_cred_alloc();
kauth_cred_setuid(cr, attrs->va_uid);
kauth_cred_seteuid(cr, attrs->va_uid);
kauth_cred_setsvuid(cr, attrs->va_uid);
kauth_cred_setgid(cr, attrs->va_gid);
kauth_cred_setegid(cr, attrs->va_gid);
kauth_cred_setsvgid(cr, attrs->va_gid);
nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr);
kauth_cred_free(cr);
}
free(attrs, M_TEMP);
/*
* A reference count is needed on the nfsnode representing the
* remote root. If this object is not persistent, then backward
* traversals of the mount point (i.e. "..") will not work if
* the nfsnode gets flushed out of the cache. Ufs does not have
* this problem, because one can identify root inodes by their
* number == UFS_ROOTINO (2). So, just unlock, but no rele.
*/
nmp->nm_vnode = vp;
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
VOP_UNLOCK(vp);
*vpp = vp;
snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++);
nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname);
return (0);
bad:
nfs_disconnect(nmp);
rw_destroy(&nmp->nm_writeverflock);
mutex_destroy(&nmp->nm_lock);
cv_destroy(&nmp->nm_rcvcv);
cv_destroy(&nmp->nm_sndcv);
cv_destroy(&nmp->nm_aiocv);
cv_destroy(&nmp->nm_disconcv);
kmem_free(nmp, sizeof(*nmp));
m_freem(nam);
return (error);
}
/*
* unmount system call
*/
int
nfs_unmount(struct mount *mp, int mntflags)
{
struct nfsmount *nmp = VFSTONFS(mp);
struct vnode *vp;
int error, flags = 0;
if (mntflags & MNT_FORCE) {
mutex_enter(&nmp->nm_lock);
flags |= FORCECLOSE;
nmp->nm_iflag |= NFSMNT_DISMNTFORCE;
mutex_exit(&nmp->nm_lock);
}
/*
* Goes something like this..
* - Check for activity on the root vnode (other than ourselves).
* - Call vflush() to clear out vnodes for this file system,
* except for the root vnode.
* - Decrement reference on the vnode representing remote root.
* - Close the socket
* - Free up the data structures
*/
/*
* We need to decrement the ref. count on the nfsnode representing
* the remote root. See comment in mountnfs().
*/
vp = nmp->nm_vnode;
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
goto err;
if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) {
VOP_UNLOCK(vp);
error = EBUSY;
goto err;
}
error = vflush(mp, vp, flags);
if (error) {
VOP_UNLOCK(vp);
goto err;
}
/*
* We are now committed to the unmount; mark the mount structure
* as doomed so that any sleepers kicked awake by nfs_disconnect
* will go away cleanly.
*/
nmp->nm_iflag |= NFSMNT_DISMNT;
/*
* No new async I/O will be added, but await for pending
* ones to drain.
*/
while (nfs_iodbusy(nmp))
kpause("nfsumnt", false, hz, NULL);
/*
* Clean up the stats... note that we carefully avoid decrementing
* nfs_mount_count here for good reason - we may not be unmounting
* the last thing mounted.
*/
iostat_free(nmp->nm_stats);
/*
* There is one reference count to get rid of here
* (see comment in mountnfs()).
*/
VOP_UNLOCK(vp);
vgone(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
rw_destroy(&nmp->nm_writeverflock);
mutex_destroy(&nmp->nm_lock);
cv_destroy(&nmp->nm_rcvcv);
cv_destroy(&nmp->nm_sndcv);
cv_destroy(&nmp->nm_aiocv);
cv_destroy(&nmp->nm_disconcv);
kmem_free(nmp, sizeof(*nmp));
return (0);
err:
if (mntflags & MNT_FORCE) {
mutex_enter(&nmp->nm_lock);
nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE;
mutex_exit(&nmp->nm_lock);
}
return error;
}
/*
* Return root of a filesystem
*/
int
nfs_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
struct nfsmount *nmp;
int error;
nmp = VFSTONFS(mp);
vp = nmp->nm_vnode;
vref(vp);
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0) {
vrele(vp);
return error;
}
*vpp = vp;
return (0);
}
extern int syncprt;
static bool
nfs_sync_selector(void *cl, struct vnode *vp)
{
KASSERT(mutex_owned(vp->v_interlock));
return !LIST_EMPTY(&vp->v_dirtyblkhd) || !UVM_OBJ_IS_CLEAN(&vp->v_uobj);
}
/*
* Flush out the buffer cache
*/
/* ARGSUSED */
int
nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp;
struct vnode_iterator *marker;
int error, allerror = 0;
/*
* Force stale buffer cache information to be flushed.
*/
vfs_vnode_iterator_init(mp, &marker);
while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector,
NULL)))
{
error = vn_lock(vp, LK_EXCLUSIVE);
if (error) {
vrele(vp);
continue;
}
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
}
vfs_vnode_iterator_destroy(marker);
return allerror;
}
/*
* NFS flat namespace lookup.
* Currently unsupported.
*/
/* ARGSUSED */
int
nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
return (EOPNOTSUPP);
}
/*
* Do that sysctl thang...
*/
static int
sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int val;
int error;
val = nfs_niothreads;
node = *rnode;
node.sysctl_data = &val;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
return nfs_set_niothreads(val);
}
static void
nfs_sysctl_init(void)
{
sysctl_createv(&nfs_clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "nfs",
SYSCTL_DESCR("NFS vfs options"),
NULL, 0, NULL, 0,
CTL_VFS, 2, CTL_EOL);
/*
* XXX the "2" above could be dynamic, thereby eliminating one
* more instance of the "number to vfs" mapping problem, but
* "2" is the order as taken from sys/mount.h
*/
sysctl_createv(&nfs_clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRUCT, "nfsstats",
SYSCTL_DESCR("NFS operation statistics"),
NULL, 0, &nfsstats, sizeof(nfsstats),
CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
sysctl_createv(&nfs_clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "iothreads",
SYSCTL_DESCR("Number of NFS client processes desired"),
sysctl_vfs_nfs_iothreads, 0, NULL, 0,
CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
}
static void
nfs_sysctl_fini(void)
{
sysctl_teardown(&nfs_clog);
}
/* ARGSUSED */
int
nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
{
size_t fidsize;
size_t fhsize;
struct nfsnode *np;
int error;
struct vattr va;
fidsize = fid->fid_len;
if (fidsize < sizeof(*fid)) {
return EINVAL;
}
fhsize = fidsize - sizeof(*fid);
if ((fhsize % NFSX_UNSIGNED) != 0) {
return EINVAL;
}
if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) {
if (fhsize > NFSX_V3FHMAX || fhsize == 0) {
return EINVAL;
}
} else {
if (fhsize != NFSX_V2FH) {
return EINVAL;
}
}
error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np);
if (error) {
return error;
}
*vpp = NFSTOV(np);
error = VOP_GETATTR(*vpp, &va, kauth_cred_get());
if (error != 0) {
vput(*vpp);
*vpp = NULLVP;
}
return error;
}
/* ARGSUSED */
int
nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize)
{
struct nfsnode *np;
struct fid *fid;
size_t fidsize;
int error = 0;
np = VTONFS(vp);
fidsize = sizeof(*fid) + np->n_fhsize;
if (*bufsize < fidsize) {
error = E2BIG;
}
*bufsize = fidsize;
if (error == 0) {
struct fid fid_store;
fid = &fid_store;
memset(fid, 0, sizeof(*fid));
fid->fid_len = fidsize;
memcpy(buf, fid, sizeof(*fid));
memcpy(buf->fid_data, np->n_fhp, np->n_fhsize);
}
return error;
}
/*
* Vfs start routine, a no-op.
*/
/* ARGSUSED */
int
nfs_start(struct mount *mp, int flags)
{
return (0);
}
/*
* Called once at VFS init to initialize client-specific data structures.
*/
void
nfs_vfs_init(void)
{
/* Initialize NFS server / client shared data. */
nfs_init();
nfs_node_init();
/* Initialize the kqueue structures */
nfs_kqinit();
/* Initialize the iod structures */
nfs_iodinit();
nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4);
}
void
nfs_vfs_done(void)
{
nfs_node_done();
nfs_kqfini();
nfs_iodfini();
nfs_fini();
}
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